Android Programming: The Big Nerd Ranch Guide, Third Edition

Introducing ConstraintLayout

With ConstraintLayout, instead of using nested layouts you add a series of constraints to your layout. A constraint is like a rubber band. It pulls two things toward each other. So, for example, you can attach a constraint from the right edge of an ImageView to the right edge of its parent (the ConstraintLayout itself), as shown in Figure 9.3. The constraint will hold the ImageView to the right.

Figure 9.3  ImageView with a constraint on the right edge

You can create a constraint from all four edges of your ImageView (left, top, right, and bottom). If you have opposing constraints, they will ...